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Finding the Fourth Proportional to 1,006.31, 1,388.61 and 564.12

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Solution

The fourth proportional to 1,006.31, 1,388.61 and 564.12 is: 778.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.31 : 1,388.61 = 564.12 : x
  2. Step 2: Convert to fraction form
    1,006.31/1,388.61 = 564.12/x
  3. Step 3: Cross multiply
    1,006.31x = 1,388.61 × 564.12
  4. Step 4: Simplify right side
    1,006.31x = 783,342.67
  5. Step 5: Solve for x
    x = 783,342.67/1,006.31
  6. Step 6: Final answer
    x = 778.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.